diff --git a/include/configs/chromeos.h b/include/configs/chromeos.h
index 652cc10..440fd6f 100644
--- a/include/configs/chromeos.h
+++ b/include/configs/chromeos.h
@@ -267,7 +267,7 @@
  * what to boot from.
  */
 #define CONFIG_EXT2_BOOT_HELPER_SETTINGS \
-	"rootpart=3\0" \
+	"rootpart=5\0" \
 	"cros_bootfile=/boot/vmlinux.uimg\0" \
 	\
 	"script_part=c\0" \
@@ -286,6 +286,7 @@
 	\
 	"ext2_boot=" \
 		"run regen_ext2_bootargs; " \
+		"setenv rootpart 5; "\
 		"if ext2load ${devtype} ${devnum}:${rootpart} " \
 			"${loadaddr} ${cros_bootfile}; then " \
 			"if test \"${kernaddr}\" != \"\"; then "\
diff --git a/include/configs/nyan-big.h b/include/configs/nyan-big.h
index 9fc2c10..89a28da 100644
--- a/include/configs/nyan-big.h
+++ b/include/configs/nyan-big.h
@@ -12,7 +12,11 @@
 
 #include "tegra124-common.h"
 
-#include <configs/chromeos.h>
+#define CONFIG_EXTRA_BOOTARGS	\
+	"earlyprintk=ttyS0,115200n8 console=tty1 keep_bootcon " \
+	"loglevel=7 init=/sbin/init oops=panic panic=-1 " \
+	"noinitrd cros_debug vt.global_cursor_default=0 " \
+	"kern_guid=be426bbb-cd3a-d14a-8fe7-55bc7b7f12ff "
 
 /* High-level configuration options */
 #define V_PROMPT			"Tegra124 (Nyan-big) # "
@@ -94,6 +98,12 @@
 #define CONFIG_CMD_TPM
 #define CONFIG_TPM_TIS_I2C
 
+/*
+#ifndef CONFIG_SPL_BUILD
+#define CONFIG_SYS_THUMB_BUILD
+#endif
+*/
+
 #include "tegra-common-usb-gadget.h"
 #include "tegra-common-post.h"